15663821282 has 4 divisors (see below), whose sum is σ = 23495731926. Its totient is φ = 7831910640.

The previous prime is 15663821213. The next prime is 15663821309. The reversal of 15663821282 is 28212836651.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 28212836651 = 128663 ⋅219277.

It can be written as a sum of positive squares in only one way, i.e., 13865298001 + 1798523281 = 117751^2 + 42409^2 .

It is a super-2 number, since 2×15663821282² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3915955319 + ... + 3915955322.

Almost surely, 2^15663821282 is an apocalyptic number.

15663821282 is a deficient number, since it is larger than the sum of its proper divisors (7831910644).

15663821282 is an equidigital number, since it uses as much as digits as its factorization.

15663821282 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7831910643.

The product of its digits is 276480, while the sum is 44.

The spelling of 15663821282 in words is "fifteen billion, six hundred sixty-three million, eight hundred twenty-one thousand, two hundred eighty-two".